On a somewhat related note (but not worth starting a new thread over), I was once told by a front desk clerk at a Westin that I frequent and was once walked from that I had a "Do Not Walk" note in my record. I guess I had created enough of a stir when they did walk me at midnight (despite calling to notify the hotel of an impending late arrival) that they vowed never to do it again. This begs the question of why they have to input that note into anyone's record to begin with. . . but that's a question for another thread.
Because unfortunately, walks are a part of the hotel industry.
That being said, walks are unpleasant and are an ultimate last resort for the hotel. Generally speaking, if a guest is walked once, there's a decent chance they may return for another stay, especially if it is handled properly. If a guest is walked on two separate occasions, they'll most likely never return. Once is bad enough, twice is just business suicide.